feat(i18n): add Polish (pl_PL) translation support

Author: kancheng

README.md

@@ -53,7 +53,7 @@ It is written in Python and uses Qt for its graphical interface.
 - [x] GUI customization (predefined labels / flags, auto-saving, label validation, etc) ([#144](https://github.com/wkentaro/labelme/pull/144))
 - [x] Exporting VOC-format dataset for [semantic segmentation](examples/semantic_segmentation), [instance segmentation](examples/instance_segmentation)
 - [x] Exporting COCO-format dataset for [instance segmentation](examples/instance_segmentation)
-- [x] Multilingual support `zh_CN`, `zh_TW`, `fr_FR`, `ja_JP`, `de_DE`, `hu_HU`, `ko_KR`, `es_ES`, `fa_IR`, `nl_NL`, `pt_BR`, `it_IT`, `vi_VN`, `tr_TR` (`LANG=zh_CN.UTF-8 labelme`)
+- [x] Multilingual support `zh_CN`, `zh_TW`, `fr_FR`, `ja_JP`, `de_DE`, `hu_HU`, `ko_KR`, `es_ES`, `fa_IR`, `nl_NL`, `pt_BR`, `it_IT`, `vi_VN`, `tr_TR`, `pl_PL` (`LANG=zh_CN.UTF-8 labelme`)
 - [x] AI-assisted point-to-polygon/mask annotation by SAM, EfficientSAM models
 - [x] AI text-to-annotation by YOLO-world, SAM3 models